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For immediate release: May 19, 2009

MDA to provide ground station solution for WorldView satellite program

Richmond, B.C. - MacDonald, Dettwiler and Associates Ltd. (TSX: MDA), a provider of essential information solutions, announced today it has been awarded a multi-million dollar contract from DigitalGlobe, Inc. to upgrade an existing multi-satellite ground station solution delivered by MDA in 2007. The solution will enable the confidential customer’s system to support the WorldView-1 and WorldView-2 satellites. This contract is the fourth international ground station order to-date that MDA has received from DigitalGlobe.

Under this contract, MDA will incorporate full support for DigitalGlobe’s WorldView satellites, providing a solution capable of programming, receiving and processing imagery and data from these next generation high-resolution commercial satellites. MDA is responsible for developing, integrating and installing the WorldView-1/-2 information solution at the customer’s site in the first quarter of 2010.

About MDA

MDA provides advanced information solutions that capture and process vast amounts of data, produce essential information, and improve the decision making and operational performance of business and government organizations worldwide.

Focused on markets and customers with strong repeat business potential, MDA delivers a broad spectrum of information solutions, ranging from complex operational systems, to tailored information services, to electronic information products.

MDA employs more than 3,200 people in locations across the United States, the United Kingdom, and Canada. The Company's common shares trade on the Toronto Stock Exchange under the symbol TSX:MDA.

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Forward-Looking Statements

This release contains forward-looking statements and information, which reflect the current view of MacDonald, Dettwiler and Associates Ltd. with respect to future events and financial performance. Any such forward-looking statements are subject to risks and uncertainties and MDA's actual results of operations could differ materially from historical results or current expectations. Additional information on these and other potential factors that could affect MDA's financial results are detailed in documents filed from time to time with the applicable Canadian securities regulatory authorities.

The Toronto Stock Exchange has neither approved nor disapproved the form or content of this release.

For more information, please contact:

Wendy Keyzer
MDA External Relations
Telephone: 604-231-2743

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